Thore CimbalandClaude Sonnet 5
376772078a
unattended-upgrades was already active on the host, just never documented or closed. Adds a generic, reusable systemd timer + script that fires before the daily update window and notifies via email and a Matrix thread reply if any packages are actually pending - reusing the mas-cli bot account pattern established for Draupnir. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
103 lines
3.5 KiB
Bash
Executable File
103 lines
3.5 KiB
Bash
Executable File
#!/bin/bash
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# Pre-update maintenance notification. Runs as a systemd oneshot service, well
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# before apt-daily-upgrade.timer's own window, and tells you (Mail + Matrix)
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# which packages are about to be auto-upgraded - so a post-update problem can
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# immediately be traced back to "the update ran, that's probably it".
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#
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# Generic by design: no instance-specific values are hardcoded here. All of
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# them live in /etc/maintenance-notify/config - see config.example in this
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# same directory, and docs/deployment-guides/07-host-maintenance-notifications.md
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# for the full setup guide.
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set -euo pipefail
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CONFIG_FILE="/etc/maintenance-notify/config"
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MATRIX_TOKEN_FILE="/etc/maintenance-notify/matrix-token"
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if [ ! -f "$CONFIG_FILE" ]; then
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echo "Missing $CONFIG_FILE - see docs/deployment-guides/07-host-maintenance-notifications.md" >&2
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exit 1
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fi
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# shellcheck source=/dev/null
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. "$CONFIG_FILE"
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: "${MATRIX_HOMESERVER:?MATRIX_HOMESERVER not set in $CONFIG_FILE}"
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: "${MATRIX_ROOM_ID:?MATRIX_ROOM_ID not set in $CONFIG_FILE}"
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: "${MATRIX_THREAD_EVENT_ID:?MATRIX_THREAD_EVENT_ID not set in $CONFIG_FILE}"
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: "${MAIL_FROM:?MAIL_FROM not set in $CONFIG_FILE}"
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: "${MAIL_TO:?MAIL_TO not set in $CONFIG_FILE}"
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apt-get update -qq
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DRYRUN_OUTPUT="$(unattended-upgrade --dry-run -v 2>&1)"
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# Exact log strings taken from /usr/bin/unattended-upgrade itself (verified
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# live on the target host), not guessed - this is the one message emitted
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# when there is nothing to do, and the one line emitted with the package
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# list otherwise. They're mutually exclusive.
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if echo "$DRYRUN_OUTPUT" | grep -q "No packages found that can be upgraded unattended"; then
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echo "No pending upgrades - nothing to notify."
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exit 0
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fi
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PENDING_PKGS="$(echo "$DRYRUN_OUTPUT" | sed -n 's/^.*Packages that will be upgraded: //p' | tail -1)"
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if [ -z "$PENDING_PKGS" ]; then
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echo "No pending upgrade packages parsed - nothing to notify."
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exit 0
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fi
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HOST_LABEL="$(hostname -f 2>/dev/null || hostname)"
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NOW="$(date '+%Y-%m-%d %H:%M %Z')"
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BODY="Host: ${HOST_LABEL}
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Zeitpunkt: ${NOW}
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Im naechsten apt-daily-upgrade.timer-Fenster werden folgende Pakete automatisch aktualisiert:
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${PENDING_PKGS}
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Automatische Vorab-Benachrichtigung, keine Aktion erforderlich."
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send_mail() {
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if ! command -v msmtp >/dev/null 2>&1; then
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echo "msmtp not installed, skipping mail notification" >&2
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return 1
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fi
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{
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echo "From: ${MAIL_FROM}"
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echo "To: ${MAIL_TO}"
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echo "Subject: [${HOST_LABEL}] Anstehendes Update"
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echo
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echo "$BODY"
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} | msmtp -a maintenance-notify -- "${MAIL_TO}"
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}
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send_matrix() {
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if [ ! -f "$MATRIX_TOKEN_FILE" ]; then
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echo "Missing $MATRIX_TOKEN_FILE, skipping Matrix notification" >&2
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return 1
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fi
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local token txn_id encoded_room payload
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token="$(cat "$MATRIX_TOKEN_FILE")"
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txn_id="$(uuidgen)"
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encoded_room="$(jq -rn --arg s "$MATRIX_ROOM_ID" '$s|@uri')"
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payload="$(jq -n --arg body "$BODY" --arg event_id "$MATRIX_THREAD_EVENT_ID" \
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'{msgtype: "m.text", body: $body, "m.relates_to": {rel_type: "m.thread", event_id: $event_id}}')"
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curl -sS -f -X PUT \
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-H "Authorization: Bearer ${token}" \
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-H "Content-Type: application/json" \
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--data "$payload" \
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"${MATRIX_HOMESERVER}/_matrix/client/v3/rooms/${encoded_room}/send/m.room.message/${txn_id}" \
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> /dev/null
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}
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mail_ok=0
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matrix_ok=0
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send_mail && mail_ok=1
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send_matrix && matrix_ok=1
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if [ "$mail_ok" -eq 0 ] && [ "$matrix_ok" -eq 0 ]; then
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echo "Both mail and Matrix notification failed" >&2
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exit 1
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fi
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